| 1 | /* |
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| 2 | * __boot.S - kernel multiboot header |
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| 3 | * |
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| 4 | * Copyright (c) 2008,2009,2010,2011,2012 Ghassan Almaless |
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| 5 | * Copyright (c) 2011,2012 UPMC Sorbonne Universites |
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| 6 | * |
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| 7 | * This file is part of ALMOS-kernel. |
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| 8 | * |
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| 9 | * ALMOS-kernel is free software; you can redistribute it and/or modify it |
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| 10 | * under the terms of the GNU General Public License as published by |
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| 11 | * the Free Software Foundation; version 2.0 of the License. |
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| 12 | * |
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| 13 | * ALMOS-kernel is distributed in the hope that it will be useful, but |
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| 14 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 16 | * General Public License for more details. |
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| 17 | * |
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| 18 | * You should have received a copy of the GNU General Public License |
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| 19 | * along with ALMOS-kernel; if not, write to the Free Software Foundation, |
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| 20 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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| 21 | */ |
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| 22 | |
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| 23 | .section .boot,"ax",@progbits |
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| 24 | .global _start, start |
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| 25 | .extern kboot_entry |
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| 26 | |
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| 27 | #define MULTIBOOT_HEADER_MAGIC 0x1BADB002 |
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| 28 | #define MULTIBOOT_HEADER_FLAGS 0x00000003 |
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| 29 | #define CHECKSUM -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS) |
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| 30 | |
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| 31 | _start: |
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| 32 | jmp start |
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| 33 | |
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| 34 | /* -------- The Multiboot header -------- */ |
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| 35 | .align 4 |
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| 36 | multiboot_header: |
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| 37 | .int MULTIBOOT_HEADER_MAGIC |
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| 38 | .int MULTIBOOT_HEADER_FLAGS |
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| 39 | .int CHECKSUM |
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| 40 | /* ----- Multiboot Header Ends Here ----- */ |
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| 41 | .extern tempGdt |
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| 42 | .extern sys_stack |
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| 43 | start: |
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| 44 | pushl %ebx |
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| 45 | call kboot_entry |
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| 46 | cli |
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| 47 | hlt |
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| 48 | |
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| 49 | |
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| 50 | .section .bss |
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| 51 | .global __boot_stack |
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| 52 | .space 4096 |
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| 53 | __boot_stack: |
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